The Everfree Forest has long laid dormant since its cursed trees ever appeared in the slowly defrosting remains of Old Equestria. Yet, in recent years, the forest has almost doubled in size, slowly covering Equestria in its thorny grasp and endangering several settlements of the House Earthborn. General Applejack, suspecting the work of the House Everfree, sends a strike force, under the command of her own brother, Big Macintosh, or, "the Guardian" to his troops, to drive the forest back in a tide of flame. However, Mistress Fluttershy of the House Everfree feels offense at these movements, and begins to make a military movement of her own...
Equestria Divided Universe property of PoorYorickDA. Art was found on Derpibooru, so I have no idea who actually drew it. But credit to them, too.